I was waiting to see if someone would mention this one. I was a little skeptical about the Butt Out tool as well until I saw it on clearance at Walmart and decided to try it. It has worked well on about a dozen deer and is now one of those gadgets that I take with me hunting.

http://www.hunterspec.com/Updateable...&categoryID=15

What I always thought was a gadget is that mechanical speed loader that looks more like a detonator. Does it work well?